package com.study

fun main(){
    println("kotlin 启动!")

    var a:Int=-1
    if(a in 1..10)
    {
        println("1到10")
    }
    else if(a in 11..20)
    {
        println("11..20");
    } else if(a !in 1..20)
    {
        print("不在1到20")
    }
}